Beechcraft E33

The airframe is aluminium: sheet metal over a riveted frame, the way most aircraft have been built since the 1940s. The FAA has issued 4 airworthiness directives (orders that owners must comply with) that name this model, most of them about engine. Operators and repair shops have filed 9 failure reports with the FAA since 1997, 2 of them in the last ten years: about 0.7 a year for every 100 aircraft on the register; the system most often named is engine. 147 approved modifications exist for it, the most by D'Shannon Products LTD..

Sources: the FAA's type certificate data sheets, airworthiness directives, supplemental type certificates, special conditions and special airworthiness information bulletins (Dynamic Regulatory System), and the FAA's service difficulty reports. A failure report is what an operator or repair station chose to file; the counts show reporting as much as reliability, and larger and commercial fleets report more. How the systems are grouped.